The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into a single call, thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example, within a single execution of a program, the output of every __builtin_darn() call may be the same.
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
|Base Score:||7.5||Base Metrics:||AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N|
|Access Vector:||Network||Attack Complexity:||Low|
|Privileges Required:||None||User Interaction:||None|
|Integrity Impact:||None||Availability Impact:||None|
|Oracle Linux version 8 (gcc)||ELSA-2020-1864||2020-05-05|
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